As an update, a couple of 'civil engineers' have just arrived to lay a 1cm diameter conduit from the small inspection trap, run it down the garden so as to have it emerge close to the external fibre optic junction box at the front of the house.

I will still have to wait for another team of people to come and actually install the fibre optic cable and connect it all up to the router. I do wonder if the task will ever get finished!